end piece on balancer help

A handy person from brentwood ca says:
I have a 3350de BSI. the length is 34" but i am having a hard time picking between the 390 and the 351 for my window. its a half inch width too.
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Tom from SWISCO responded:
Thanks for posting. The only difference between these two balances is the depth of the shoe. You will need to measure yours to determine the better match between them.
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